1212312115 has 16 divisors (see below), whose sum is σ = 1701266688. Its totient is φ = 811966176.

The previous prime is 1212312113. The next prime is 1212312139. The reversal of 1212312115 is 5112132121.

It is not a de Polignac number, because 1212312115 - 2¹ = 1212312113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212312092 and 1212312101.

It is not an unprimeable number, because it can be changed into a prime (1212312113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 401257 + ... + 404266.

It is an arithmetic number, because the mean of its divisors is an integer number (106329168).

Almost surely, 2^1212312115 is an apocalyptic number.

1212312115 is a deficient number, since it is larger than the sum of its proper divisors (488954573).

1212312115 is an equidigital number, since it uses as much as digits as its factorization.

1212312115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805578.

The product of its digits is 120, while the sum is 19.

The square root of 1212312115 is about 34818.2727170663. The cubic root of 1212312115 is about 1066.2805362913.

Adding to 1212312115 its reverse (5112132121), we get a palindrome (6324444236).

The spelling of 1212312115 in words is "one billion, two hundred twelve million, three hundred twelve thousand, one hundred fifteen".